// Mixin for overriding input placeholder.
@mixin input-placeholder($color) {
  &::-webkit-input-placeholder {
    color: $color;
  }
  &:-moz-placeholder { /* Firefox 18- */
    color: $color;
  }
  &::-moz-placeholder { /* Firefox 19+ */
    color: $color;
  }
  &:-ms-input-placeholder {
    color: $color;
  }
}
